http://erewhon.superkuh.com/library/Space/Costs%20And%20Difficulties%20Of%20Large-Scale%20Messaging%20And%20The%20Need%20For%20International%20Debate%20on%20Potential%20Risks_%20John%20Billingham_%20James%20Benford_%20SETI_%20arxiv11021938v2.pdf

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